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PCI: leave MEM and IO decoding disabled during 64-bit BAR sizing, too

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After 253d2e5498, we disable MEM and IO decoding for most devices while we
size 32-bit BARs.  However, we restore the original COMMAND register before
we size the upper 32 bits of 64-bit BARs, so we can still cause a conflict.

This patch waits to restore the original COMMAND register until we're
completely finished sizing the BAR.

Reference: https://lkml.org/lkml/2007/8/25/154
Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2012-07-06 12:08:18 -06:00
parent cfaf025112
commit bbffe43524
1 changed files with 3 additions and 3 deletions
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6
drivers/pci/probe.c
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@ -152,9 +152,6 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
pci_read_config_dword(dev, pos, &sz);
pci_write_config_dword(dev, pos, l);
if (!dev->mmio_always_on)
pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
/*
* All bits set in sz means the device isn't working properly.
* If the BAR isn't implemented, all bits must be 0. If it's a
@ -239,6 +236,9 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
}
out:
if (!dev->mmio_always_on)
pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
fail:
res->flags = 0;